Use only that which works, and take it from any place you can find it.
--Bruce Lee
That seems rather applause-lighty. The reversal is abnormal; who would say "Use some things that don't work"? Maybe in some traditionalist cultures "Resist the appeal of using things that work but come from unworthy places" would sound wise, but on LessWrong it would likely get stares.
Here's the new thread for posting quotes, with the usual rules: